Plaster-lath.



PATENTED JUNE 25, 1907. F. W. FARRINGTON 6b S. B. BURCHABD.

W/r/VESSES UNITED. STATES .PATENT OEEIOE. ,l

FRED W. FAEEINGTON AND SENECA BARTON4 BUROHARD, OE MINNEAPOLIS,

. MINNESOTA. p f

PLASTER-LATH.

, Specification of Letters Patent.

Patented June 25, 1907.

Application led February 12, 1906. Serial No. 300,726.

, lath usually used.

A further object is to provide a lath which will be lighter in proportion to its area than a metal lath, and consequently will not require a backing or frame of such a substan t1a1 nature as 1s generally used or required for a metal lath.

The invention consists, generally, in providing a lath or board com osed of plaster of paris containing, preferab y, a suitable percentage of fibrous material and reinforcing wires included by the thickness of the lath, and bracing and strengthening the same.

In the accompanying drawing forming part of thiss ecliication, Figure 1 is aseotional view o a plaster lath embodying our invention. Fig. 2 is a plan view showlng a modiied means for arranging the reinforclng wire therein. Figs. 3, 4, 5 and 6 are similar views illustratin other modications in the arrangement of t e reinforcing wires. Fig.`7 is a perspective view of the "lath, and Fig.`8 is a transverse sectional view showing the position of the wires in the lath.

In the drawing, 2 represents a lath or boardhgenerally made about four inches in Width and from three to four feet in length, and composed of a mixture of plaster of paris and a fibrous material, usually ground straw or cha or comminuted wood, mixed in suitable pro ortions, and pressed together in a mold. he fibrous material being mingled with the plaster of paris will bind the particles together and act as a bond uniting the plaster in one homogeneous sheet, which will be tenacious and possess iexibility to a considerable degree, suficient at least to allow the lath to be nailed on a surface and slightly r`bent, if necessary, without breaking. The -proportion of librous material in the lath may e varied according to the degree of tenacity required and the sizeof the lath and the desired maximum of cost.A The larger the percentage of fibrous material for a lath of iven dimensions the lower will be the cost o production.

For the vpurpose of reinforcing the lath we embed a wire 3 therein during th'e moldin operation, extending it from end to end an crosswise thereof in a direction parallel with the edges, as shown in Fig. 1. This wire is of suitable gage, and while not adding materially to the weight of the lath will greatly stren then it and ermit it to be handled and naile on the wal without danger of breakage. The wire at the ends of the lath is preferably located at a point where the nails are usually 'driven through, vand the nail shank passin through the lath, either inside or outside o the wire and contacting therewith, will, when the head is driven into the surface of the lath, lock is securely on the Wall. If the nails aredriven. through between the transverse sections of the wire and contact therewith, the lath will be securely held against bending or bucklingl between the nail points.

In Figs. 2, 3, 4 and 5 we have shown a lath wherein the Wire is laid in transverse ways representing in Fig. 2 substantially the form of the letter Z and a figure 8 in the next illustration, and looped designs in Figs. 4 and 5.

In Fig. 6, also shown in section in'Fig. 8, the wires are preferablyl in the form of rods laid or embedded in the lath independently of one another and extending from end to end and crosswise thereof at intervals. We have indicated the longitudinal wires in Fig. 8 by numeral 4, and the osition of the transverse wires is indicate by dotted linesin Fig..6. v

As shown in al1 the es, we prefer to rovide beveled longitudmal edges 5 for .the iaths which, when they are secured on the wall, will form grooves between the abutting laths to permit the entrance of the plaster and provIde means for binding it more securely on the lath.

I claim as my invention:

A laster lath consisting of a flat comparati'vely thin sheet rectangular inform andy IOO near the points Where nails are usually In witness whereof, We have hereunto set driven through the lath7 whereby the Shanks our hands this 5th day of February 1906. of the nails will Contact with said transverse FRED W. FARRINGTON.

portions and tension the longitudinal secv SENECA BARTON BURCHARD. 5 tions ofthe Wire and lock the lath securely on Witnesses:

the Wall and prevent it from bending and RICHARD PAUL,

buckling. C. MAGNAMARA. ,y 

